let getTipDoms = function() {
	let boxTip = document.querySelector(".box_tip h1");
	let i = 5;
	setInterval(function() {
		if (i>1) {
			i--;
			boxTip.innerText = '0' + (i+1);
		} else {
			i=5;
			boxTip.innerText = '01';
		}
		
	}, 2000)
}

window.onload = function() {
	getTipDoms();
}

